package cn.woblog.recyclerviewsample.util;

/**
 * Created by Pich on 2015/8/31 0031.
 */

import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Rect;
import android.util.DisplayMetrics;
import android.view.View;
import android.view.WindowManager;

/**
 * 获得屏幕相关的辅助类
 */
public class ScreenUtil {

  private ScreenUtil() {
        /* cannot be instantiated */
    throw new UnsupportedOperationException("cannot be instantiated");
  }

  /**
   * 获得屏幕高度
   */
  public static int getScreenWidth(Context context) {
    WindowManager wm = (WindowManager) context
        .getSystemService(Context.WINDOW_SERVICE);
    DisplayMetrics outMetrics = new DisplayMetrics();
    wm.getDefaultDisplay().getMetrics(outMetrics);
    return outMetrics.widthPixels;
  }

  /**
   * 获得屏幕宽度
   */
  public static int getScreenHeight(Context context) {
    WindowManager wm = (WindowManager) context
        .getSystemService(Context.WINDOW_SERVICE);
    DisplayMetrics outMetrics = new DisplayMetrics();
    wm.getDefaultDisplay().getMetrics(outMetrics);
    return outMetrics.heightPixels;
  }

  /**
   * 获得状态栏的高度
   */
  public static int getStatusHeight(Context context) {

    int statusHeight = -1;
    try {
      Class<?> clazz = Class.forName("com.android.internal.R$dimen");
      Object object = clazz.newInstance();
      int height = Integer.parseInt(clazz.getField("status_bar_height")
          .get(object).toString());
      statusHeight = context.getResources().getDimensionPixelSize(height);
    } catch (Exception e) {
      e.printStackTrace();
    }
    return statusHeight;
  }

  /**
   * 获取当前屏幕截图，包含状态栏
   */
  public static Bitmap snapShotWithStatusBar(Activity activity) {
    View view = activity.getWindow().getDecorView();
    view.setDrawingCacheEnabled(true);
    view.buildDrawingCache();
    Bitmap bmp = view.getDrawingCache();
    int width = getScreenWidth(activity);
    int height = getScreenHeight(activity);
    Bitmap bp = null;
    bp = Bitmap.createBitmap(bmp, 0, 0, width, height);
    view.destroyDrawingCache();
    return bp;

  }

  /**
   * 获取当前屏幕截图，不包含状态栏
   */
  public static Bitmap snapShotWithoutStatusBar(Activity activity) {
    View view = activity.getWindow().getDecorView();
    view.setDrawingCacheEnabled(true);
    view.buildDrawingCache();
    Bitmap bmp = view.getDrawingCache();
    Rect frame = new Rect();
    activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);
    int statusBarHeight = frame.top;

    int width = getScreenWidth(activity);
    int height = getScreenHeight(activity);
    Bitmap bp = null;
    bp = Bitmap.createBitmap(bmp, 0, statusBarHeight, width, height
        - statusBarHeight);
    view.destroyDrawingCache();
    return bp;

  }

}